According to the study, the only difference between the control group and study group was the additions to the fly media. Both groups were dusted the same with Repashy Calcium plus and additional Vit A every 3 months.Are they talking about medium fortification or dusting?
What the study did not try to confirm was whether additional carotenoid dusting would have made similar improvements.
The flies nutritive value definitely appears to have improved, but could the same effect have been shown with additional dusting is unknown.
Seems to support the argument for feeding a variety of different feeder insects.